If there's one musical style that epitomizes summer, it might be the loping island style of ska. It caught fire in early '60s Jamaica, a precursor to reggae. Player utilities PopoutShare 00:0000:00 download This story is based on a radio interview. Listen to the full interview. But ska has gone through a few iterations. Ska is really a fusion of American R&B with Jamaican jazz, says Brad Klein, a Minneapolis-based filmmaker who traced the history of ska in a documentary, "Legends of Ska. Without Ska, there is no reggae." "Bob Marley, Peter Tosh, and Jimmy Cliff ... all started in...